package ranab.jar;

import java.util.zip.ZipEntry;


/**
 * Compare two zip entries based on the file name.
 *
 * @author <a href="mailto:rana_b@yahoo.com">Rana Bhattacharyya</a>
 */
public
class ZipNameComparator extends ZipComparator  {
	
	public int compare(Object o1, Object o2)  {
		if (!(o1 instanceof java.util.zip.ZipEntry && o1 instanceof java.util.zip.ZipEntry))  {
			throw new IllegalArgumentException("Not a ZipEntry object."); 
		}
		
		ZipEntry z1 = (ZipEntry)o1;
		ZipEntry z2 = (ZipEntry)o2;
		return getName(z1).compareTo(getName(z2));
	}
	
	public boolean equals(Object o1, Object o2)  {
		if (!(o1 instanceof java.util.zip.ZipEntry && o1 instanceof java.util.zip.ZipEntry))  {
			throw new IllegalArgumentException("Not a ZipEntry object."); 
		}
		
		ZipEntry z1 = (ZipEntry)o1;
		ZipEntry z2 = (ZipEntry)o2;
		return getName(z1).equals(getName(z2));
	}
	
	/**
	 * get the ZipEntry file name
	 */
	public static String getName(ZipEntry entry)  {
		String fullName = entry.getName();
		int index = fullName.lastIndexOf('/');
		if (index == -1) 	 {
			return fullName;
		}
		else if (index == (fullName.length() -1))  {
				return "";
		}
		return fullName.substring(index + 1);
	}
	
	/**
	 * get header name
	 */
	 public String getHeaderName()  {
	 	return "Name";
	 }
}